I was at Borth Cliffs by the memorial on Monday last. Little of note appeared at sea despite the large flocks of seabirds near the Dyfi Estuary. A pair of colour ringed choughs did turn up however. One bird had a yellow ring on the left leg with white (or silver) on the right. The second bird just had a white (or silver) ring on the right leg with nothing on the left.
I've emailed TC about them via Ruffled Feathers